Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Salad Dressing with Butter
Ingredients
Directions
Make the dressing
Melt the butter in a saucepan.
Add the flour and stir until smooth, being careful not to brown.
Add the milk and boil over hot water.
In a bowl, beat the eggs, salt, pepper, and mustard together, then add the vinegar.
Combine this mixture with the first mixture and stir until it thickens like soft custard, about five minutes.
Cool and store
Set aside to cool, then bottle and refrigerate.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + mustardtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Enriches the dressing and adds richness to the sauce.
- Flour
- Thickens the butter and milk base into a smooth sauce.
- Milk
- Forms the liquid base that thickens as it heats.
- Eggs
- Set when heated, thickening the dressing into a custard-like texture.
- Vinegar
- Adds acidity that gives the dressing its tangy flavour.
- Mustard
- Adds sharp flavour and helps the dressing taste bright.
The step that matters
Stir the egg mixture into the hot base until it thickens. Egg proteins set with gentle heat and thicken the sauce, but if the mixture overheats or is stirred too little it can curdle or stay thin. Stirring steadily keeps the texture smooth.
Swap the mustard
How well each one fits the dish's main ingredients (butter, flour, sugar, pepper, milk, vinegar, egg):
- Capsicumfits better
- Shallotfits about as well
- Mustardthe original
- Chivefits about as well
Fit is the average pairing score against butter, flour, sugar, pepper, milk, vinegar, egg. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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